49ers' Greenlaw suspended for head-butting helmetless Seahawks LB

San Francisco 49ers linebacker Dre Greenlaw has been suspended for one game without pay by the NFL for unsportsmanlike conduct following an incident during Sunday's game against the Seattle Seahawks. Greenlaw was penalized for head-butting a helmetless Seahawks linebacker during the contest. The suspension was handed down by the league as a disciplinary measure for the dangerous and unsportsmanlike behavior.